The main goal of the project is the experimental and theoretical study of the fundamental and practical limits of magnetization dynamics and kinetics of magnetic phase transitions in in ferro- ferri-, and antiferromagnets. To reach this goal the high sensitive time- and spectrally resolved methods based on the magneto-optical Kerr and Faraday effects, magnetic birefringence and magnetization-induced second harmonic generation will be implemented. Large, and close to perfect quality single crystals of a representative series of the rare earth orthoferrites, manganites and oxycuprates will be grown. The study of thin films of magnetic metals will constitute a important part of the project.
A special emphasis in the project will be put on the study of ultra-fast dynamics and kinetics of field-induced, spontaneous, orientation and order-disorder magnetic phase transitions in the listed above model magnetic materials. Theoretically, it is intended to reveal the mechanisms of relaxation of highly anisotropic distribution of the order parameter, which are induced by the ultra-fast external pump pulse, to find non-relaxation mechanisms of the energy transfer into the subsystem of the short wavelength (thermal) magnons and phonons, to develop analytical and numerical tools for the analysis of the local phase transition to the quasi-homogeneous non-stationary state.
The main expected results are:
- Original seeded-flux growth technology will be developed and high quality single crystals of magnetic oxides suitable for the optical investigation of ultra-fast magnetic phenomena will be grown. High-quality thin films of magnetic metals will be prepared.
- By studying the three groups of strongly correlated materials with different spin-orbit and electron-phonon coupling parameters the mechanisms of ultra-fast spin dynamics on subpicosecond time scale will be revealed.
- The particular features of magnetization dynamics of field induced, spontaneous, orientation, and order-disorder magnetic phase transitions will be distinguished.
- An analytical theory of the evolution of inhomogeneous magnetization excitations will be developed.
- Fundamental and practical limits of magnetization reversal dynamics will be revealed.